Adsorption behavior of silver quantum dots by a novel super magnetic CoFe2O4-biochar-polymeric nanocomposite

Mahmoud, Mohamed E.; Abouelanwar, Magda E.; Mahmoud, Safe ELdeen M.E.; Salam, Mohamed Abdel

doi:10.1016/j.jcis.2021.08.102

Cited by 31 publications

(4 citation statements)

References 42 publications

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“…Magnetic nanoparticles are a kind of nanomaterials. It is widely used in the fields of biology, medicine, and chemical engineering [9][10][11][12][13], on account of its unique nano-size effect and magnetic properties. For example, Chen et al [14] proposed Ti 2 O 3 nanoparticles as a pure Ti 3+ system for the electrosynthesis of NH 3 and the yield of NH 3 was significantly better than other titanium-based adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of α-Fe₂O₃/Fe₃O₄ heteroplasmon nanoparticles via the hydrolysis-combustion-calcination process of iron nitrate

Liu

Zhang

Wang

et al. 2022

Mater. Res. Express

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In this work, a feasible and facile hydrolysis-combustion-calcination process of ferric nitrate for the preparation of magnetic α-Fe2O3/Fe3O4 heteroplasmon nanoparticles was represented. The influences of hydrolysis time, hydrolysis temperature, Fe3+ concentration, anhydrous ethanol volume, calcination time, and calcination temperature on the properties of α-Fe2O3/Fe3O4 heteroplasmon nanoparticles were investigated. According to a series of characterization analysis, the optimal preparation conditions were confirmed: 0.05 M Fe(NO3)3·9H2O was hydrolyzed at 90 ℃ for 8 h, and then the precursor was calcined at 200 ℃ for 2 h with 20 mL anhydrous ethanol. While, the morphology of α-Fe2O3/Fe3O4 heteroplasmon were spherical structures with the average particle size of about 46 nm, and their saturation magnetization was 54 emu g-1. The α-Fe2O3/Fe3O4 heteroplasmon nanoparticles possessed controllable magnetic properties and a more stable state, which suggested promising applications.

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Section: Introductionmentioning

confidence: 99%

Preparation and characterization of α-Fe₂O₃/Fe₃O₄ heteroplasmon nanoparticles via the hydrolysis-combustion-calcination process of iron nitrate

Liu

Zhang

Wang

et al. 2022

Mater. Res. Express

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“…Vikrant et al developed a Cu–magnesium (Mg) bimetal oxide-modified biochar that displayed a synergistic function for the adsorption and catalytic oxidation of HCHO at room temperature. Additionally, bamboo carbon microfibers activated by a steam explosion, carbonization, and plasma were prepared for HCHO adsorption and each achieved a good performance . These studies focused on the modification of biochar materials through the incorporation of metals or metal oxides, as well as surface group modifications.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, bamboo carbon microfibers activated by a steam explosion, carbonization, and plasma were prepared for HCHO adsorption and each achieved a good performance. 27 These studies focused on the modification of biochar materials through the incorporation of metals or metal oxides, as well as surface group modifications. However, little attention has been given to the characterization of the inorganic metal species and surface functional groups present in biochar materials.…”

Section: ■ Introductionmentioning

confidence: 99%

Surface Structure Analysis and Formaldehyde Removal Mechanism of Lotus Shell Biochar: An Experimental and Theoretical Perspective

Zhang

Fan

et al. 2023

Langmuir

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The adsorption of gaseous HCHO by raw lotus shell biochar carbonized at 500, 700, and 900 °C from the perspective of its internal crystal structure and surface functional groups was investigated by an integrated approach of experiments and density functional theory calculations. The results showed that lotus shell biochar carbonized at 700 °C had the best adsorption effect at a HCHO concentration of 10.50 ± 0.30 mg/m 3 , with an adsorption removal rate of 87.64%. The HCHO removal efficiency by lotus shell biochar carbonized at 500 and 900 °C was determined to be 80.96 and 83.07%, respectively. The HCHO adsorption on lotus shell biochar carbonized at 700 °C conformed to pseudo-second-order kinetics and was predominantly controlled by chemical adsorption. The Langmuir isotherm was the underlying mechanism for the monomolecular layer adsorption with a maximum adsorption capacity of 0.329 mg/g. The density functional theory calculations revealed that the adsorption of HCHO on the surface of CaCO 3 and KCl in lotus shell biochar carbonized at 700 °C was a chemical adsorption process, with adsorption energies ranging from −64.375 to −87.554 kJ/mol. The strong interaction between HCHO and the surface was attributed to the electron transfer from HCHO to the surface, facilitated by metal atoms (Ca or K) and the oxygen atoms of HCHO. The carboxyl group on the surface of lotus shell biochar carbonized at 700 °C was identified as the key functional group responsible for HCHO adsorption. This study advanced our understanding of the environmental functions of inorganic crystals and surface functional groups in raw biochar and will enable the further development of biochar materials in environmental applications.

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“…wastewater to eliminate heavy metals like silver and other contaminants in wastewater prior to its further applications or final discharge [10,11].…”

Section: Introductionmentioning

confidence: 99%

Silver adsorption on biochar produced from spent coffee grounds: validation by kinetic and isothermal modelling

Islam

Parvin

Dada

et al. 2022

Biomass Conv. Bioref.

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This study investigates silver adsorption on biochar produced from pyrolysis of spent coffee grounds (SCGs). Biochars were produced from SCGs at temperatures between 500 and 1000 °C. SCG-derived biochars were then characterised by different analytical methods, such as Brunauer-Emmet-Teller (BET), Fourier transform infrared (FTIR), X-ray diffraction (XRD), and investigated for silver removal. The results revealed that the biochar produced at 500 °C offered a maximum surface area of 40.1 m2/g with a yield of 23.48% biochar and the highest silver adsorption capacity of 49.0 mg/g with 99.9% silver removal efficiency. The morphology of adsorbed silver on biochar was determined using scanning electron microscopy–energy-dispersive spectrometry (SEM–EDS), and XRD analyses, which showed an even distribution of silver on the biochar surface. Furthermore, X-ray photoelectron spectroscopy (XPS) confirmed that part of the silver ions was reduced to form metallic silver (Ag0)/silver nanoparticles (Ag NPs) during adsorption. The kinetics and isothermal evaluation suggested that silver adsorption was dominated by the pseudo-second-order model and Langmuir isotherm, which means that silver adsorption was mainly dominated by chemisorption and monolayer on biochar surface. Overall, this study suggests that 500 °C was the most feasible pyrolysis temperature to produce SCG-derived biochar with suitable physicochemical properties that can efficiently adsorb silver species from wastewater. Graphical Abstract

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Adsorption behavior of silver quantum dots by a novel super magnetic CoFe2O4-biochar-polymeric nanocomposite

Cited by 31 publications

References 42 publications

Preparation and characterization of α-Fe₂O₃/Fe₃O₄ heteroplasmon nanoparticles via the hydrolysis-combustion-calcination process of iron nitrate

Preparation and characterization of α-Fe₂O₃/Fe₃O₄ heteroplasmon nanoparticles via the hydrolysis-combustion-calcination process of iron nitrate

Surface Structure Analysis and Formaldehyde Removal Mechanism of Lotus Shell Biochar: An Experimental and Theoretical Perspective

Silver adsorption on biochar produced from spent coffee grounds: validation by kinetic and isothermal modelling

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Adsorption behavior of silver quantum dots by a novel super magnetic CoFe2O4-biochar-polymeric nanocomposite

Cited by 31 publications

References 42 publications

Preparation and characterization of α-Fe2O3/Fe3O4 heteroplasmon nanoparticles via the hydrolysis-combustion-calcination process of iron nitrate

Preparation and characterization of α-Fe2O3/Fe3O4 heteroplasmon nanoparticles via the hydrolysis-combustion-calcination process of iron nitrate

Surface Structure Analysis and Formaldehyde Removal Mechanism of Lotus Shell Biochar: An Experimental and Theoretical Perspective

Silver adsorption on biochar produced from spent coffee grounds: validation by kinetic and isothermal modelling

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Preparation and characterization of α-Fe₂O₃/Fe₃O₄ heteroplasmon nanoparticles via the hydrolysis-combustion-calcination process of iron nitrate

Preparation and characterization of α-Fe₂O₃/Fe₃O₄ heteroplasmon nanoparticles via the hydrolysis-combustion-calcination process of iron nitrate